Section Three's main responsibility is special projects for use within the UNSC. With that, it also oversees all of the various groups who do this.[5] This has lead to the creation of many assets such as the NOVA bomb, the MJOLNIR project, and many other "black ops."[6]

Though a few of Section III's programs are well known and celebrated for their success, the Marines and top brass of the UNSC treat most with contempt. This is especially true of the Spartans, who are regarded as "freaks" by some humans.